Since 2007, one day a year has marked Earth Hour, during which folks across the globe shut off the lights and unplug for an hour to draw attention to energy overuse and climate change.
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| This year, the Empire State Building, the London Eye, the Eiffel Tower, and Victoria Falls, Zimbabwe will all go dark for Earth Hour, according to the event's. |
This year's event is now upon us: Earth Hour 2011 is tonight at 8:30 p.m. (local time).
